I have a data of 100 patients. FVC at normal posture, kyphotic posture and slumped posture. Now how I could command in SPSS for ANOVA to get the p value?
I suggest that you focus first on effect size, i.e., what effect size would be clinically important? P values alone can be misleading. I suggest you also report confidence intervals and examine the effect size relative to the confidence interval.
Anyhow, do you have three measures on each patient, or three groups of patients? Please clarify.
Based on your description, it sounds like you have repeated measures (i.e., each patient was measured three times, once for each posture). Google "SPSS repeated measures ANOVA" and you will surely find lots of tutorials explaining how to run this.
Thank David Leiwehr Sir and Stephen Sir. I have taken three measures on each patients!
Given your recent post, I agree with Stephen P-A that your data represent repeated measures: three measures per patient. Repeated measures are not independent measures and must be modeled to account for their correlation.
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